is it a, egypt, b, iran, c, iraq or d, afghanistan? we'll tell you the correct answer in just a moment. go to cnn.com/fareed for more of the gps challenge and follow us on twitter or facebook. also if you miss a show or special, they're on i tunes. the audio broadcast is free or you can buy the video version. monday marks the 150th anniversary of the battle of antitum where more than 120 soldiers were killed or injured in just 20 minutes of fighting. this book is one of the finest books written on the civil war "this republic of suffering" by drew foust, who also happens to be president of harvard university. it is a profound, moving book on how the civil war changed our understanding of death. there is a feature documentary on the book that's out this week as well. now for the last look. these photos caught my eye this week. they look like stunning photographs taken out of one of nasa's multi-million-dollar satellites, except these images weren't taken by satellite, they were a product of the students' science project, one that cost a